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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8c463cc8733e22a292b6c963cbb4a2f2730f8bb74be74fa025bdb95d6b929b' 
  AND token = 'qDEvTIBxVM8N1/9tTbcEJtfu9Nlx9FcGVupai9SRQqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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