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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcdf4b9efee30b092a2f848f631f2b2679c84e9846f76f69884f5c847873945' 
  AND token = '4LJ6/3PAQf26HBfASAxY4TC0JTL4MXZ+aNFME7VZ5XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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