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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08cae03c0116e106ffe5bdc37e72ca88d0b5c33b0f59cfa2538f30c5577eb31' 
  AND token = 'stgRTzNYUxja1EQeDzr++IVnpO8seYK/1Gjv1ebkl+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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