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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e313f2c06c4cdbe42aeafa6ace1980c9976c044966c9716c936cbdd176bd6e93' 
  AND token = 'yJoVsQV/bsj0kV0Er/gawlRyb3lje1l3W89zhGFWaGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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