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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623dda3f8156b14afc4334a4c952fa2acee1c3223d46b5f90e93a12e8f99038f' 
  AND token = 'x9rLecF8x/+IO0lydPbzhAQx7Dh8N2g2bY6+anOcx1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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