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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9b11cd840de5e9feeef62236d92362608cc99eb8177ee023e7a4d8a06952ef' 
  AND token = 'mAo5lSZrRLg15RjKmv88hMd0P05LGzid7x5PBiirvxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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