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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff043c58b9f9bb70c8f7873b87dbbe0f372fb5801ef98853862c79d119acc052' 
  AND token = '9PNjoDu/QV2aLNRWqm7C/sFfyfH+bV64yeRQ3DXt2fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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