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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9965fb37974386f486520ea3c31cd285cc23c5b31ca2bfdd3eca271aa961835f' 
  AND token = 'YWX59966+ZV0iB5bZHGwmLqOpUZC3BHIPeIxImb70IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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