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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0915ba57cc9dc0f06c372a4a5a2b6f9021b2aad3bcf1c9a495402ecc27a82704' 
  AND token = '8TfZN7KkET2oAHJvODJPnWdnBCLY07egu+VNxnauJnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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