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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e35b55b4f1ac5d78602bf2814459ec3a77942570982c5e372c8969f1fff8cd8' 
  AND token = 'rcxv8CpWomic+Vtd5vgKI3K4ipMI1U/oiUrs/CqZhMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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