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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a205a160b528a9652000d68cbed10ddef11244789e1b0540a1e9fbc2f81481' 
  AND token = 'hB1J2cb9Ar5jDqrh2hx/XELFTvqQ399vwrnHs1ES2Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}