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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9832f982229dc1cf7f49b53cb5ba47c059b564ac918def064d6c5673f287876' 
  AND token = 'C2+RoCfL+VSk15MtsYDiRN7QQ34tT/FmVoUZYWnga6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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