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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9bcbdfd0ee39c83f0b143ed78941fe46605df3c1e3981a2b3aab7ac00e41a6a' 
  AND token = 'FLGjIfmBcCJ9MfEaQR8qvKufLs9VCHmjuWHaKWTfR1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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