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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e354fc8c6a6a75c4a5f700bfacb7b3edde6b66024547f96291f749fbc8a83027' 
  AND token = '2WTpaf9MLp7J540x7DkigGrfpTc4Hkb+VQ3GKzQtF9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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