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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f530fd1ce5786d514d9a1d9e8b4613c06ff951d6a522362ddb24b513a02d66c0' 
  AND token = '3elivEiz1Ck7zmY8jWInNblmWLdGywYIqBnUkFB44YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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