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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fb42a287424892761e3cda942529c0fe0e9e366c276ac653a82e5c935c94b8' 
  AND token = 'pVCek6rHoJinV5jdUo8SLikw7OJYdWo2Dx+nJRsB1VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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