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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30deca9db17ef21a2f9b5c6377dcde99a3fa2e6803984ac668ced85a8197bb92' 
  AND token = 'eCBOYwGeYloRikLBNbopOhNlsYiY0m5Rhdrlf7nvBEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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