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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c1396e68ef19c7c13f91d26c74f8116f6c9a638aa96d713e5d6f3aaa87d276' 
  AND token = 'AMgV0NbGHfyMaorH8uaXU0tu8pz5AWo+iUaL/CTwhKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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