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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f021b9a8b592fc81621c771b8a5e2c1fcc8936a63070f6bb55b7682dcd0f4d6d' 
  AND token = 'm4Nn4b3aMZvDvE0CJ2s6RqUOmyYz0015fUvuZ9IUY7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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