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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c12c0e340b890c445f0d1848b321e66082789f4892c0a695ddaf4dcd2e292cb' 
  AND token = '2yyYDssxT8X0dSUfHzvEmusNn4cpXXhcHRzZZdP1aww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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