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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c320e3cbfe707ce40585f42925337e2ffc9230781c48dce459c8a637be73bb' 
  AND token = 'xgD3Q0nsi/EfNuqaUoHoyEJ5DfLjFSLkRn+ord0CxlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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