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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a081ec229739157c0ae2deba611d217aafcf961b585a7994573c34c06a6a047' 
  AND token = 'Rbyyo6pJtoh+O6EZ/Bi9vfySQvzW8fon8ZsDpv+adEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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