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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e5ccc8d564fe1aad03a4b678c74b8c549893ba5182bb039aeebb5899472095' 
  AND token = '6fV1hK3aXmpk4SvgXnuZtXnxvrGxdetmH0epYVeRP6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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