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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fcc084085c73ad12d254266177409e8112da0d479fc78077e0395b63c11d02a' 
  AND token = 'CD8CfjApppIheaZpWx5SZ4159YfaXDQOiRZ7JPXfne8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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