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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e10bd2e933ce6c97fa58f8535a7bacf50287b6cf4bafe90e2d4577d8fe59f5' 
  AND token = 'SgWmELYSMfwh7Ts8A4h70QnO4pVWzNq+XBwD62c3qAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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