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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c7870ae313742ccca6babe76afcc1a8d9b1310a9eacf2084114665643bd7e4' 
  AND token = 'zyKZaj4Y0h6JbEVqibGmVdU7baaa3d+tLI0ZN9jS3to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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