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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b527b952c470e4bb619f78cdc57a7ea742707410d453a2161a4a749aacbfaf7' 
  AND token = 'kJQrMoPXvdcotL005Sm7x5SLHXPc5PO8XlMXnIPEPso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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