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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae7964c0b67623c690943492eb9f637a313e2db2356907df2ecbb0bcfabf3bf' 
  AND token = 'YC348l0pOurpj9qxCwi/LmokO4XICZ9Jk9kbSDbyKrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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