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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810dfad64364a22791798a1150ace986feb100fad5ea2b9e47c2177aa59a7c28' 
  AND token = '2cIfFDHszGAvgaGYmOA3Zq/wGUOp6EVn1e7EkDD4uC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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