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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae04dbe0a0f13ba36fde0c2bebac49637d4991fe2165025ed77dee04597b5c6a' 
  AND token = 'UtG1OrgoLx8lApCGq9yGANvsazy6c62Ljm8lyxedldw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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