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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc436682cb2cf5d280fe24982f7b3741986f41d4b539ce521f1cb45db347164e' 
  AND token = 'ok7XfqnXNNbiKn8RL7S2ByX+E792V4lZdCD3MGMuplk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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