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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e3d3b5f8a505086d94b35a3e3abccdc3a290450435d541315df1e6a4a4349e' 
  AND token = 'X15ztZEXbrOM2K49CT0ZfzHjHar5P0nM7pw1SwXN8oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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