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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09da288d92159f643c717159e19fd5dd5c061204f2c122cbfc7787ca10ecc7f2' 
  AND token = 'gMSH1PxEDpfXy/rLWvOovFQBEj4cU0sv4F7a8EdzsmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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