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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df576896fc0f7d342f9a5c312c010571a505651952b9768fa6a6ace1f19b7b97' 
  AND token = 'xF2rpQSdLu2HCXPTOenBOZxAUSMIIWC94DagDw5D+JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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