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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8668b07aa4f3dca9b3fde4ecffefcb9942493df3bd61f8c386d5e7ec9c815873' 
  AND token = 'Ek/JHlYgxWnnwM1n017MERnPq4TuAjCT6XcBjq9/5CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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