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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc4ddaf0d5e45314d941c9a5c7a58afbb61cd0c96981e21b02524b6796a6bd5' 
  AND token = 'g3O2iCCeMH04FfcYMo5Z0PEDsIR2OxJfZOfnzfFnocM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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