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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1065eaf406457191200e4806405b569c5fdf668d4e41c6ca3ea19bb4ab34d32' 
  AND token = 'jmDLF59aEPJc7oQcNXSOdA/By88QWeAbL2sOikfiaoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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