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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20be234f15e488ecf1b35536758cbcb27b5415e3f1a5c56106acf4672fd4184' 
  AND token = 'GDZE7CYWqh3ix2QEfYgn7H3+W7Ek4g3XL/i5SwAmUUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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