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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837ad60d81117972eec35e7b55658ed4cb59aa3b12f0e0bdcb6424c5496e9f0c' 
  AND token = 'Imnz8DO4XtJ2lZKsLP880RW1N4qmf2SNOsUOdPL/9e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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